Word: scans
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Dates: during 1960-1969
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During its other mode of operation the "eye" of the spectrometer will scan the entire disc of the sun in alternating east-to-west and north-to-south motions...
...information recorded by the instrument will then be recorded and relayed to earth on command. Each complete scan will take about four-and-one-half minutes and should provide a crude ultra-violet picture of the whole...
During its scanning mode, the Harvard spectrometer can build up and store about 12 ultra-violet pictures of the whole sun each hour, recording the occurrence and spread of solar flares in every direction. However, it can scan only one wave-length at a time...
Ever since Galileo taught them to scan the skies with a telescope, astronomers have studied the sun with particular interest. It is the earth's own star, and to earth-bound viewers it glitters with 10 billion times the brightness of any other celestial body. Everything significant that happens on the sun-the emergence of solar flares, for example-signals some effect on the earth's atmosphere...
When Mariner comes close to Venus, a radiometer will scan the planet's surface to detect the microwave emissions that would indicate the presence of water in the atmosphere and the temperature at the planet's surface. In a companion experiment, an infra-red radiometer will also scan Venus to get readings on temperature and atmospheric conditions...